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w in (-oo:+oo)
4/5-((4/5)*w) = 22/15 // - 22/15
4/5-((4/5)*w)-(22/15) = 0
(-4/5)*w+4/5-22/15 = 0
-4/5*w-2/3 = 0 // + 2/3
-4/5*w = 2/3 // : -4/5
w = 2/3/(-4/5)
w = -5/6
w = -5/6
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